/*

 * Copyright (c) 2010, Oracle America, Inc.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 * - Redistributions of source code must retain the above copyright notice,

 *   this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright notice,

 *   this list of conditions and the following disclaimer in the documentation

 *   and/or other materials provided with the distribution.

 * - Neither the name of the "Oracle America, Inc." nor the names of its

 *   contributors may be used to endorse or promote products derived

 *   from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * rpcb_clnt.c

 * interface to rpcbind rpc service.

 */

#include <pthread.h>

#include <reentrant.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/un.h>

#include <sys/utsname.h>

#include <rpc/rpc.h>

#include <rpc/rpcb_prot.h>

#include <rpc/nettype.h>

#include <netconfig.h>

#ifdef PORTMAP

#include <netinet/in.h>		/* FOR IPPROTO_TCP/UDP definitions */

#include <rpc/pmap_prot.h>

#endif				/* PORTMAP */

#include <stdio.h>

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <netdb.h>

#include <syslog.h>

#include <assert.h>

#include "rpc_com.h"

#include "debug.h"

static struct timeval tottimeout = { 60, 0 };

static const struct timeval rmttimeout = { 3, 0 };

static struct timeval rpcbrmttime = { 15, 0 };

extern bool_t xdr_wrapstring(XDR *, char **);

static const char nullstring[] = "\000";

#define RPCB_OWNER_STRING "libtirpc"

#define	CACHESIZE 6

struct address_cache {

	char *ac_host;

	char *ac_netid;

	char *ac_uaddr;

	struct netbuf *ac_taddr;

	struct address_cache *ac_next;

};

static struct address_cache *front;

static int cachesize;

#define	CLCR_GET_RPCB_TIMEOUT	1

#define	CLCR_SET_RPCB_TIMEOUT	2

extern int __rpc_lowvers;

static struct address_cache *check_cache(const char *, const char *);

static void delete_cache(struct netbuf *);

static void add_cache(const char *, const char *, struct netbuf *, char *);

static CLIENT *getclnthandle(const char *, const struct netconfig *, char **);

static CLIENT *local_rpcb(void);

#ifdef NOTUSED

static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);

#endif

/*

 * This routine adjusts the timeout used for calls to the remote rpcbind.

 * Also, this routine can be used to set the use of portmapper version 2

 * only when doing rpc_broadcasts

 * These are private routines that may not be provided in future releases.

 */

bool_t

__rpc_control(request, info)

	int	request;

	void	*info;

{

	switch (request) {

	case CLCR_GET_RPCB_TIMEOUT:

		*(struct timeval *)info = tottimeout;

		break;

	case CLCR_SET_RPCB_TIMEOUT:

		tottimeout = *(struct timeval *)info;

		break;

	case CLCR_SET_LOWVERS:

		__rpc_lowvers = *(int *)info;

		break;

	case CLCR_GET_LOWVERS:

		*(int *)info = __rpc_lowvers;

		break;

	default:

		return (FALSE);

	}

	return (TRUE);

}

/*

 *	It might seem that a reader/writer lock would be more reasonable here.

 *	However because getclnthandle(), the only user of the cache functions,

 *	may do a delete_cache() operation if a check_cache() fails to return an

 *	address useful to clnt_tli_create(), we may as well use a mutex.

 */

/*

 * As it turns out, if the cache lock is *not* a reader/writer lock, we will

 * block all clnt_create's if we are trying to connect to a host that's down,

 * since the lock will be held all during that time.

 */

extern rwlock_t	rpcbaddr_cache_lock;

/*

 * The routines check_cache(), add_cache(), delete_cache() manage the

 * cache of rpcbind addresses for (host, netid).

 */

static struct address_cache *

check_cache(host, netid)

	const char *host, *netid;

{

	struct address_cache *cptr;

	/* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */

	for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {

		if (!strcmp(cptr->ac_host, host) &&

		    !strcmp(cptr->ac_netid, netid)) {

			LIBTIRPC_DEBUG(3, ("check_cache: Found cache entry for %s: %s\n", 

				host, netid));

			return (cptr);

		}

	}

	return ((struct address_cache *) NULL);

}

static void

delete_cache(addr)

	struct netbuf *addr;

{

	struct address_cache *cptr, *prevptr = NULL;

	/* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */

	for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {

		if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {

			free(cptr->ac_host);

			free(cptr->ac_netid);

			free(cptr->ac_taddr->buf);

			free(cptr->ac_taddr);

			if (cptr->ac_uaddr)

				free(cptr->ac_uaddr);

			if (prevptr)

				prevptr->ac_next = cptr->ac_next;

			else

				front = cptr->ac_next;

			free(cptr);

			cachesize--;

			break;

		}

		prevptr = cptr;

	}

}

static void

add_cache(host, netid, taddr, uaddr)

	const char *host, *netid;

	char *uaddr;

	struct netbuf *taddr;

{

	struct address_cache  *ad_cache, *cptr, *prevptr;

	ad_cache = (struct address_cache *)

			malloc(sizeof (struct address_cache));

	if (!ad_cache) {

		return;

	}

	ad_cache->ac_host = strdup(host);

	ad_cache->ac_netid = strdup(netid);

	ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL;

	ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf));

	if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr ||

			(uaddr && !ad_cache->ac_uaddr))

		goto out_free;

	ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len;

	ad_cache->ac_taddr->buf = (char *) malloc(taddr->len);

	if (ad_cache->ac_taddr->buf == NULL)

		goto out_free;

	memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len);

	LIBTIRPC_DEBUG(3, ("add_cache: Added to cache: %s : %s\n", host, netid));

/* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  cptr */

	rwlock_wrlock(&rpcbaddr_cache_lock);

	if (cachesize < CACHESIZE) {

		ad_cache->ac_next = front;

		front = ad_cache;

		cachesize++;

	} else {

		/* Free the last entry */

		cptr = front;

		prevptr = NULL;

		while (cptr->ac_next) {

			prevptr = cptr;

			cptr = cptr->ac_next;

		}

		LIBTIRPC_DEBUG(3, ("add_cache: Deleted from cache: %s : %s\n",

			cptr->ac_host, cptr->ac_netid));

		free(cptr->ac_host);

		free(cptr->ac_netid);

		free(cptr->ac_taddr->buf);

		free(cptr->ac_taddr);

		if (cptr->ac_uaddr)

			free(cptr->ac_uaddr);

		if (prevptr) {

			prevptr->ac_next = NULL;

			ad_cache->ac_next = front;

			front = ad_cache;

		} else {

			front = ad_cache;

			ad_cache->ac_next = NULL;

		}

		free(cptr);

	}

	rwlock_unlock(&rpcbaddr_cache_lock);

	return;

out_free:

	free(ad_cache->ac_host);

	free(ad_cache->ac_netid);

	free(ad_cache->ac_uaddr);

	free(ad_cache->ac_taddr);

	free(ad_cache);

}

/*

 * This routine will return a client handle that is connected to the

 * rpcbind. If targaddr is non-NULL, the "universal address" of the

 * host will be stored in *targaddr; the caller is responsible for

 * freeing this string.

 * On error, returns NULL and free's everything.

 */

static CLIENT *

getclnthandle(host, nconf, targaddr)

	const char *host;

	const struct netconfig *nconf;

	char **targaddr;

{

	CLIENT *client;

	struct netbuf *addr, taddr;

	struct netbuf addr_to_delete;

	struct __rpc_sockinfo si;

	struct addrinfo hints, *res, *tres;

	struct address_cache *ad_cache;

	char *tmpaddr;

	if (nconf == NULL) {

		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;

		return NULL;

	}

	if (nconf->nc_protofmly != NULL &&

	    strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0 &&

	    host == NULL) {

		rpc_createerr.cf_stat = RPC_UNKNOWNHOST;

		return NULL;

	}

/* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  ad_cache */

	/* Get the address of the rpcbind.  Check cache first */

	client = NULL;

	if (targaddr)

		*targaddr = NULL;

	addr_to_delete.len = 0;

	rwlock_rdlock(&rpcbaddr_cache_lock);

	ad_cache = NULL;

	if (host != NULL)

		ad_cache = check_cache(host, nconf->nc_netid);

	if (ad_cache != NULL) {

		addr = ad_cache->ac_taddr;

		client = clnt_tli_create(RPC_ANYFD, nconf, addr,

		    (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);

		if (client != NULL) {

			if (targaddr && ad_cache->ac_uaddr)

				*targaddr = strdup(ad_cache->ac_uaddr);

			rwlock_unlock(&rpcbaddr_cache_lock);

			return (client);

		}

		addr_to_delete.len = addr->len;

		addr_to_delete.buf = (char *)malloc(addr->len);

		if (addr_to_delete.buf == NULL) {

			addr_to_delete.len = 0;

		} else {

			memcpy(addr_to_delete.buf, addr->buf, addr->len);

		}

	}

	rwlock_unlock(&rpcbaddr_cache_lock);

	if (addr_to_delete.len != 0) {

		/*

		 * Assume this may be due to cache data being

		 *  outdated

		 */

		rwlock_wrlock(&rpcbaddr_cache_lock);

		delete_cache(&addr_to_delete);

		rwlock_unlock(&rpcbaddr_cache_lock);

		free(addr_to_delete.buf);

	}

	if (!__rpc_nconf2sockinfo(nconf, &si)) {

		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;

		assert(client == NULL);

		goto out_err;

	}

	memset(&hints, 0, sizeof hints);

	hints.ai_family = si.si_af;

	hints.ai_socktype = si.si_socktype;

	hints.ai_protocol = si.si_proto;

	LIBTIRPC_DEBUG(3, ("getclnthandle: trying netid %s family %d proto %d socktype %d\n",

	    nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype));

	if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {

		client = local_rpcb();

		if (! client) {

			LIBTIRPC_DEBUG(1, ("getclnthandle: %s", 

				clnt_spcreateerror("local_rpcb failed")));

			goto out_err;

		} else {

			struct sockaddr_un sun;

			if (targaddr) {

				*targaddr = malloc(sizeof(sun.sun_path));

				strncpy(*targaddr, _PATH_RPCBINDSOCK,

				    sizeof(sun.sun_path));

			}

			return (client);

		}

	} else {

		if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) {

			rpc_createerr.cf_stat = RPC_UNKNOWNHOST;

			assert(client == NULL);

			goto out_err;

		}

	}

	for (tres = res; tres != NULL; tres = tres->ai_next) {

		taddr.buf = tres->ai_addr;

		taddr.len = taddr.maxlen = tres->ai_addrlen;

		if (libtirpc_debug_level > 3 && log_stderr) {

			char *ua;

			int i;

			ua = taddr2uaddr(nconf, &taddr);

			fprintf(stderr, "Got it [%s]\n", ua); 

			free(ua);

			fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n",

				taddr.len, taddr.maxlen);

			fprintf(stderr, "\tAddress is ");

			for (i = 0; i < taddr.len; i++)

				fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]);

			fprintf(stderr, "\n");

		}

		client = clnt_tli_create(RPC_ANYFD, nconf, &taddr,

		    (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);

		if (! client) {

			LIBTIRPC_DEBUG(1, ("getclnthandle: %s", 

				clnt_spcreateerror("clnt_tli_create failed")));

		}

		if (client) {

			tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL;

			if (host)

				add_cache(host, nconf->nc_netid, &taddr, tmpaddr);

			if (targaddr)

				*targaddr = tmpaddr;

			break;

		}

	}

	if (res)

		freeaddrinfo(res);

out_err:

	if (!client && targaddr)

		free(*targaddr);

	return (client);

}

/*

 * Create a PMAP client handle.

 */

static CLIENT *

getpmaphandle(nconf, hostname, tgtaddr)

	const struct netconfig *nconf;

	const char *hostname;

	char **tgtaddr;

{

	CLIENT *client = NULL;

	rpcvers_t pmapvers = 2;

	/*

	 * Try UDP only - there are some portmappers out

	 * there that use UDP only.

	 */

	if (nconf == NULL || strcmp(nconf->nc_proto, NC_TCP) == 0) {

		struct netconfig *newnconf;

		if ((newnconf = getnetconfigent("udp")) == NULL) {

			rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;

			return NULL;

		}

		client = getclnthandle(hostname, newnconf, tgtaddr);

		freenetconfigent(newnconf);

	} else if (strcmp(nconf->nc_proto, NC_UDP) == 0) {

		if (strcmp(nconf->nc_protofmly, NC_INET) != 0)

			return NULL;

		client = getclnthandle(hostname, nconf, tgtaddr);

	}

	/* Set version */

	if (client != NULL)

		CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers);

	return client;

}

/* XXX */

#define IN4_LOCALHOST_STRING	"127.0.0.1"

#define IN6_LOCALHOST_STRING	"::1"

/*

 * This routine will return a client handle that is connected to the local

 * rpcbind. Returns NULL on error and free's everything.

 */

static CLIENT *

local_rpcb()

{

	CLIENT *client;

	static struct netconfig *loopnconf;

	static char *hostname;

	extern mutex_t loopnconf_lock;

	int sock;

	size_t tsize;

	struct netbuf nbuf;

	struct sockaddr_un sun;

	/*

	 * Try connecting to the local rpcbind through a local socket

	 * first. If this doesn't work, try all transports defined in

	 * the netconfig file.

	 */

	memset(&sun, 0, sizeof sun);

	sock = socket(AF_LOCAL, SOCK_STREAM, 0);

	if (sock < 0)

		goto try_nconf;

	sun.sun_family = AF_LOCAL;

	strcpy(sun.sun_path, _PATH_RPCBINDSOCK);

	nbuf.len = SUN_LEN(&sun);

	nbuf.maxlen = sizeof (struct sockaddr_un);

	nbuf.buf = &sun;

	tsize = __rpc_get_t_size(AF_LOCAL, 0, 0);

	client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG,

	    (rpcvers_t)RPCBVERS, tsize, tsize);

	if (client != NULL) {

		/* Mark the socket to be closed in destructor */

		(void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL);

		return client;

	}

	/* Nobody needs this socket anymore; free the descriptor. */

	close(sock);

try_nconf:

/* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */

	mutex_lock(&loopnconf_lock);

	if (loopnconf == NULL) {

		struct netconfig *nconf, *tmpnconf = NULL;

		void *nc_handle;

		int fd;

		nc_handle = setnetconfig();

		if (nc_handle == NULL) {

			/* fails to open netconfig file */

			syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);

			rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;

			mutex_unlock(&loopnconf_lock);

			return (NULL);

		}

		while ((nconf = getnetconfig(nc_handle)) != NULL) {

#ifdef INET6

			if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 ||

#else

			if ((

#endif

			     strcmp(nconf->nc_protofmly, NC_INET) == 0) &&

			    (nconf->nc_semantics == NC_TPI_COTS ||

			     nconf->nc_semantics == NC_TPI_COTS_ORD)) {

				fd = __rpc_nconf2fd(nconf);

				/*

				 * Can't create a socket, assume that

				 * this family isn't configured in the kernel.

				 */

				if (fd < 0)

					continue;

 				close(fd);

				tmpnconf = nconf;

				if (!strcmp(nconf->nc_protofmly, NC_INET))

					hostname = IN4_LOCALHOST_STRING;

				else

					hostname = IN6_LOCALHOST_STRING;

			}

		}

		if (tmpnconf == NULL) {

 			rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;

			mutex_unlock(&loopnconf_lock);

			return (NULL);

		}

		loopnconf = getnetconfigent(tmpnconf->nc_netid);

		/* loopnconf is never freed */

		endnetconfig(nc_handle);

	}

	mutex_unlock(&loopnconf_lock);

	client = getclnthandle(hostname, loopnconf, NULL);

	return (client);

}

/*

 * Set a mapping between program, version and address.

 * Calls the rpcbind service to do the mapping.

 */

bool_t

rpcb_set(program, version, nconf, address)

	rpcprog_t program;

	rpcvers_t version;

	const struct netconfig *nconf;	/* Network structure of transport */

	const struct netbuf *address;		/* Services netconfig address */

{

	CLIENT *client;

	bool_t rslt = FALSE;

	RPCB parms;

	char uidbuf[32];

	/* parameter checking */

	if (nconf == NULL) {

		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;

		return (FALSE);

	}

	if (address == NULL) {

		rpc_createerr.cf_stat = RPC_UNKNOWNADDR;

		return (FALSE);

	}

	client = local_rpcb();

	if (! client) {

		return (FALSE);

	}

	/* convert to universal */

	/*LINTED const castaway*/

	parms.r_addr = taddr2uaddr((struct netconfig *) nconf,

				   (struct netbuf *)address);

	if (!parms.r_addr) {

		CLNT_DESTROY(client);

		rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;

		return (FALSE); /* no universal address */

	}

	parms.r_prog = program;

	parms.r_vers = version;

	parms.r_netid = nconf->nc_netid;

	/*

	 * Though uid is not being used directly, we still send it for

	 * completeness.  For non-unix platforms, perhaps some other

	 * string or an empty string can be sent.

	 */

	(void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());

	parms.r_owner = uidbuf;

	CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb,

	    (char *)&parms, (xdrproc_t) xdr_bool,

	    (char *)&rslt, tottimeout);

	CLNT_DESTROY(client);

	free(parms.r_addr);

	return (rslt);

}

/*

 * Remove the mapping between program, version and netbuf address.

 * Calls the rpcbind service to do the un-mapping.

 * If netbuf is NULL, unset for all the transports, otherwise unset

 * only for the given transport.

 */

bool_t

rpcb_unset(program, version, nconf)

	rpcprog_t program;

	rpcvers_t version;

	const struct netconfig *nconf;

{

	CLIENT *client;

	bool_t rslt = FALSE;

	RPCB parms;

	char uidbuf[32];

	client = local_rpcb();

	if (! client) {

		return (FALSE);

	}

	parms.r_prog = program;

	parms.r_vers = version;

	if (nconf)

		parms.r_netid = nconf->nc_netid;

	else {

		/*LINTED const castaway*/

		parms.r_netid = (char *) &nullstring[0]; /* unsets  all */

	}

	/*LINTED const castaway*/

	parms.r_addr = (char *) &nullstring[0];

	(void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());

	parms.r_owner = uidbuf;

	CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb,

	    (char *)(void *)&parms, (xdrproc_t) xdr_bool,

	    (char *)(void *)&rslt, tottimeout);

	CLNT_DESTROY(client);

	return (rslt);

}

#ifdef NOTUSED

/*

 * From the merged list, find the appropriate entry

 */

static struct netbuf *

got_entry(relp, nconf)

	rpcb_entry_list_ptr relp;

	const struct netconfig *nconf;

{

	struct netbuf *na = NULL;

	rpcb_entry_list_ptr sp;

	rpcb_entry *rmap;

	for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) {

		rmap = &sp->rpcb_entry_map;

		if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) &&

		    (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) &&

		    (nconf->nc_semantics == rmap->r_nc_semantics) &&

		    (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) {

			na = uaddr2taddr(nconf, rmap->r_maddr);

			LIBTIRPC_DEBUG(3, ("got_entry: Remote address is [%s] %s", 

				rmap->r_maddr, (na ? "Resolvable" : "Not Resolvable")));

			break;

		}

	}

	return (na);

}

/*

 * Quick check to see if rpcbind is up.  Tries to connect over

 * local transport.

 */

bool_t

__rpcbind_is_up()

{

	struct netconfig *nconf;

	struct sockaddr_un sun;

	void *localhandle;

	int sock;

	nconf = NULL;

	localhandle = setnetconfig();

	while ((nconf = getnetconfig(localhandle)) != NULL) {

		if (nconf->nc_protofmly != NULL &&

		    strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)

			 break;

	}

	if (nconf == NULL)

		return (FALSE);

	endnetconfig(localhandle);

	memset(&sun, 0, sizeof sun);

	sock = socket(AF_LOCAL, SOCK_STREAM, 0);

	if (sock < 0)

		return (FALSE);

	sun.sun_family = AF_LOCAL;

	strncpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path));

	if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) < 0) {

		close(sock);

		return (FALSE);

	}

	close(sock);

	return (TRUE);

}

#endif

#ifdef PORTMAP

static struct netbuf *

__try_protocol_version_2(program, version, nconf, host, tp)

	rpcprog_t program;

	rpcvers_t version;

	const struct netconfig *nconf;

	const char *host;

	struct timeval *tp;

{

	u_short port = 0;

	struct netbuf remote;

	struct pmap pmapparms;

	CLIENT *client = NULL;

	enum clnt_stat clnt_st;

	struct netbuf *pmapaddress;

	RPCB parms;

	if (strcmp(nconf->nc_proto, NC_UDP) != 0

	 && strcmp(nconf->nc_proto, NC_TCP) != 0)

		return (NULL);

	client = getpmaphandle(nconf, host, &parms.r_addr);

	if (client == NULL)

		goto error;

	/*

	 * Set retry timeout.

	 */

	CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);

	pmapparms.pm_prog = program;

	pmapparms.pm_vers = version;

	pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ?

				IPPROTO_UDP : IPPROTO_TCP;

	pmapparms.pm_port = 0;	/* not needed */

	clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,

	    (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms,

	    (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port,

	    *tp);

	if (clnt_st != RPC_SUCCESS) {

		rpc_createerr.cf_stat = RPC_PMAPFAILURE;

		clnt_geterr(client, &rpc_createerr.cf_error);

		goto error;

	} else if (port == 0) {

		pmapaddress = NULL;

		rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;

		goto error;

	}

	port = htons(port);

	CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote);

	if (((pmapaddress = (struct netbuf *)

		malloc(sizeof (struct netbuf))) == NULL) ||

	    ((pmapaddress->buf = (char *)

		malloc(remote.len)) == NULL)) {

		rpc_createerr.cf_stat = RPC_SYSTEMERROR;

		clnt_geterr(client, &rpc_createerr.cf_error);

		if (pmapaddress) {

			free(pmapaddress);

			pmapaddress = NULL;

		}

		goto error;

	}

	memcpy(pmapaddress->buf, remote.buf, remote.len);

	memcpy(&((char *)pmapaddress->buf)[sizeof (short)],

			(char *)(void *)&port, sizeof (short));

	pmapaddress->len = pmapaddress->maxlen = remote.len;

	CLNT_DESTROY(client);

	return pmapaddress;

error:

	if (client) {

		CLNT_DESTROY(client);

		client = NULL;

	}

	return (NULL);

}

#endif

/*

 * An internal function which optimizes rpcb_getaddr function.  It also

 * returns the client handle that it uses to contact the remote rpcbind.

 *

 * The algorithm used: If the transports is TCP or UDP, it first tries

 * version 4 (srv4), then 3 and then fall back to version 2 (portmap).

 * With this algorithm, we get performance as well as a plan for

 * obsoleting version 2.

 *

 * For all other transports, the algorithm remains as 4 and then 3.

 *

 * XXX: Due to some problems with t_connect(), we do not reuse the same client

 * handle for COTS cases and hence in these cases we do not return the

 * client handle.  This code will change if t_connect() ever

 * starts working properly.  Also look under clnt_vc.c.

 */

struct netbuf *

__rpcb_findaddr_timed(program, version, nconf, host, clpp, tp)

	rpcprog_t program;

	rpcvers_t version;

	const struct netconfig *nconf;

	const char *host;

	CLIENT **clpp;

	struct timeval *tp;

{

#ifdef NOTUSED

	static bool_t check_rpcbind = TRUE;

#endif

	CLIENT *client = NULL;

	RPCB parms;

	enum clnt_stat clnt_st;

	char *ua = NULL;

	rpcvers_t vers;

	struct netbuf *address = NULL;

	rpcvers_t start_vers = RPCBVERS4;

	struct netbuf servaddr;

	struct rpc_err rpcerr;

	/* parameter checking */

	if (nconf == NULL) {

		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;

		return (NULL);

	}

	parms.r_addr = NULL;

	/*

	 * Use default total timeout if no timeout is specified.

	 */

	if (tp == NULL)

		tp = &tottimeout;

	parms.r_prog = program;

	parms.r_vers = version;

	parms.r_netid = nconf->nc_netid;

	/*

	 * rpcbind ignores the r_owner field in GETADDR requests, but we

	 * need to give xdr_rpcb something to gnaw on. Might as well make

	 * it something human readable for when we see these in captures.

	 */

	parms.r_owner = RPCB_OWNER_STRING;

	/* Now the same transport is to be used to get the address */

	if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) ||

			(nconf->nc_semantics == NC_TPI_COTS))) {

		/* A CLTS type of client - destroy it */

		CLNT_DESTROY(client);